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Which state of matter has only one free face?
- Solid
- Liquid
- Gas
- Plasma
Right Answer: (B) Liquid
What causes substances to dissolve in liquids?
- The liquids are heavier than solids
- The intermolecular spaces of one liquid are filled by molecules of the other
- Solids do not affect liquids
- The temperature of the liquid increases
Right Answer: (B) The intermolecular spaces of one liquid are filled by molecules of the other
What is the name of the process in which molecules spread out and mix with another substance?
- Osmosis
- Diffusion
- Evaporation
- Precipitation
Right Answer: (B) Diffusion
When two liquids are mixed, what happens to the molecules?
- They stay separate
- They do not move
- They occupy the interspaces of the other liquid
- They form a gas
Right Answer: (C) They occupy the interspaces of the other liquid
What is osmosis?
- The movement of liquids through a porous material
- The mixing of gases in the air
- The process of liquids evaporating
- The dissolution of solids in water
Right Answer: (A) The movement of liquids through a porous material
What is an example of a substance that undergoes osmosis?
- Water passing through plant cell walls
- Salt dissolving in water
- Air mixing with carbon dioxide
- Oil dissolving in alcohol
Right Answer: (A) Water passing through plant cell walls
Which of the following substances is a colloid?
- Salt
- Water
- Egg’s white
- Alcohol
Right Answer: (C) Egg’s white
Why is good ventilation important in rooms and mines?
- It helps gases mix more slowly
- It allows gases like carbon dioxide to escape
- It keeps gases from diffusing
- It prevents gases from forming mixtures
Right Answer: (B) It allows gases like carbon dioxide to escape
What is the name of the process in which liquid creeps upward in a narrow tube?
- Osmosis
- Diffusion
- Capillarity
- Evaporation
Right Answer: (C) Capillarity
Why do small drops of water assume a spherical shape?
- Because of the force of gravity
- Due to the surface tension
- Due to high temperature
- Because of the weight of the water
Right Answer: (B) Due to the surface tension
